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【单选题】
Can you go to the concert with us this evening?____________

No, I already have plans.
I’d love to, but I’m busy tonight.
No, I really don’t like being with you.
I’m ill, so I shouldn’t go out.
【单选题】
Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight(困境)while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump(垃圾场)was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump.Why was the goat-keeper chosen to remove the bushes?

Because he offered to do it for the lower price.
Because it was easier to transport his goats.
Because his goats can do the job better.
Because the city wanted to raise more goats.
【单选题】
Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight(困境)while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump(垃圾场)was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump. Why was the goat-keeper chosen to remove the bushes?

Because he offered to do it for the lower price.
Because it was easier to transport his goats.
Because his goats can do the job better.
Because the city wanted to raise more goats.
【单选题】
阅读理解:阅读下列短文,回答文后问题,选择最佳答案:Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight(困境)while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump(垃圾场)was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump.2. Why was the goat-keeper chosen to remove the bushes?

A. Because he offered to do it for the lower price.
B. Because it was easier to transport his goats.
C. Because his goats can do the job better.
D. Because the city wanted to raise more goats.
【单选题】
设A和B皆为n阶实方阵,则下面论断错误的是()。

<SPANstyle="FONT-SIZE:10.5pt;FONT-FAMILY:宋体;mso-bidi-font-size:12.0pt;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-ascii-font-family:TimesNewRoman;mso-hansi-font-family:TimesNewRoman;mso-bidi-font-family:TimesNewRoman">A与B</SPAN><SPANlang=EN-USstyle="FONT-SIZE:10.5pt;FONT-FAMILY:TimesNewRoman;mso-bidi-font-size:12.0pt;mso-fareast-font-family:宋体;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA"><SPANstyle="POSITION:relative;TOP:2pt;mso-text-raise:-2.0pt"></SPAN></SPAN><SPANstyle="FONT-SIZE:10.5pt;FONT-FAMILY:宋体;mso-bidi-font-size:12.0pt;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-ascii-font-family:TimesNewRoman;mso-hansi-font-family:TimesNewRoman;mso-bidi-font-family:TimesNewRoman">相似的充要条件是存在可逆阵P</SPAN><SPANstyle="FONT-SIZE:10.5pt;FONT-FAMILY:宋体;mso-bidi-font-size:12.0pt;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-ascii-font-family:TimesNewRoman;mso-hansi-font-family:TimesNewRoman;mso-bidi-font-family:TimesNewRoman">,使得A=P<SUP>-1</SUP>BP</SPAN>
若A是反对称矩阵,则A<SUP>T</SUP>=-A</P>
若A可逆,则A可以表示成若干个初等矩阵的乘积
若A是正交矩阵,则|A|=1